C#

Question

how to resolve this error "Input string was not in a correct format." by using this code TextBox3.Text = Convert.ToString(Convert.ToDouble(TextBox1.Text) + Convert.ToDouble (TextBox2.Text)* 0.001);

Ranjan Dailata · Answer

Converting to double without validating the input textboxes is something very bad. Please give a try with the below code var firstNum = Convert.ToDouble(TextBox1.Text); var secondNum = Convert.ToDouble(TextBox2.Text); var result = firstNum + secondNum * 0.001; TextBox3.Text = result.ToString();

ramya t · Answer

how to check the values of two dropdownlists . if both values of dropdownlists are true then execute the block of statements. please help me to write it.

ramya t · Answer

for example i give the value of textbox1 as 1000 which is the gram value.

Shweta Lodha · Answer

what do you mean by 'may be'? Could you please share some sample values for textbox 1?

ramya t · Answer

hi textbox1 vaue is integer but may be a gram or kilogram type textbox 2 value is the cost of product

Shweta Lodha · Answer

Hi ramya t, You will get such error only when you are not giving numeric value in textbox 1 and 2. Please tell me, what input are you supplying in your textboxes.

Amit Singh · Answer

Hey, refer this 1.http://www.c-sharpcorner.com/UploadFile/mahakgupta/unit-converter-part-i-mass-converter/

ramya t · Answer

product quantity textbox1 dropdownlist 1.kilogram 2.gram cost per product textbox2 Total cost textbox3 is this my form.and please help me to how to write code for converting kg to gm and vice versa. if i select kg,then get value of textbox1 and adding to textbox2 and the result will be textbox3. how to write the code.

Amit Singh · Answer

Remove Convert.ToString bcoz it indicates u r inserting string value

ramya t · Answer

yaa..i try to insert integer value only in textbox 3.

Amit Singh · Answer

You r try to insert integer value in textbox3.box I am right

C#

Iftikar Hussain